Plant Water Relations: Quiz – 2 8

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Solve 15 Online MCQs (Multiple Choice Questions) on Plant Water Relations. Quiz Test No. 02
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Plant Water Relations: Quiz - 2

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Question 1
Which one of the following is produced during water stress and causes closure of stomata?
A
Auxin
B
Abscisic acid
C
Cytokinin
D
Gibberellin
Question 2
Bacteria cannot survive in a highly salted pickle because
A
Salt inhibits reproduction of bacteria
B
Enough light is available for photosynthesis
C
They become plasmolysed and death occurs
D
Nutrients in the pickle medium can not support life
Question 3
Conduction of sap in plants occurs through
A
Heart wood
B
Bark
C
Xylem
D
All the above
Question 4
Conversion of starch to organic acid is essential for stomatal
A
closure
B
opening
C
initiation
D
growth
Question 5
Diffusion of water from selectively permeable membrane is known as
A
Active absorption
B
Passive absorption
C
Osmosis
D
Diffusion
Question 6
Dixon and Jolly are associated with
A
Light reaction of photosynthesis
B
Anaerobic respiration
C
Cohesion theory of Ascent of sap
D
Apical dominance
Question 7
During absorption of water by roots, the water potential of cell sap is lower than that of
A
pure water and soil solution
B
neither pure water nor soil solution
C
pure water, but higher than that of soil solution
D
soil solution, but higher than that of pure water
Question 8
Field capacity is
A
Higher for sandy soils than clay soils
B
Amount of water in soil available to plants
C
Same as permanent wilting point
D
Amount of water left in soil after drainage
Question 9
The chief water conducting elements of xylem in gymnosperms are
A
Tracheids
B
Vessels
C
Fibers
D
Transfusion tissue
Question 10
Increase in the CO2 concentration of micro environment of leaf would cause
A
closure of stomata
B
opening of stomata
C
no effect on stomata
D
widening of stomata
Question 11
Flooding kills plants because
A
Cell sap in plants become too dilute
B
Root respiration ceases
C
Cell sap in plants become too dilute
D
Excess water Ieaches down plant nutrients.
Question 12
Guard cells differ from epidermal cells in having
A
Nucleus
B
Mitochondria
C
Ribosomes
D
Chloroplasts
Question 13
Guttation is caused by
A
Transpiration
B
Osmosis/DPD
C
Root pressure
D
Osmotic pressure
Question 14
If CO2 concentration suddenly increases around the leaf, one of the following events occurs
A
Stomata open gradually
B
Stomata open suddenly
C
Transpiration will not be affected
D
Decrease in transpiration due to sudden closure of stomata
Question 15
If the concentration of external solution is more than the cytoplasm, the solution is known as
A
Hypertonic
B
Isotonic
C
Hypotonic
D
None of these
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